An embodiment of the invention provides an application running device and a terminal device. The application running device comprises a scanning module, a starting operation detection module, a first safety detection module, a starting module, an event detection module and a second safety detection module; the scanning module is used for scanning a specified type of application in the current operation system; the starting operation detection module is used for detecting the starting operation of the specified type of application; the first safety detection module is used for performing the first safety detection on the running environment of the application before the application is started; the starting module is used for starting the application after a result of the first safety detection indicates that the running environment is safe; the event detection module is used for detecting a preset event in the running process of the application; the second safety detection module is used for triggering the second safety detection on the preset event in the application. According to the application running device and the terminal device, the safety of the running environment when the application is started is effectively ensured and the safety of the application in the running process is effectively ensured.